This is the first alpha for UBCD V5.1 whose primary purpose is to solicit feedback.

The major structure change in this release is moving FreeDOS UBCD and DOS apps to an ISO image (\ubcd\images\fdubcd.iso.gz). The reason for this change is to allow FreeDOS-based apps to work even on systems where FreeDOS has problems recognizing/mounting the source CD or USB memory stick.

A new script has been created (\ubcd\tools\win32\mkfdubcd\mkfdubcd.cmd) that lets you create your own fdubcd.iso.gz after extracting it to a folder outside of the extracted UBCD folder hierarchy.

But, if someone would want to try UBCD51a1 to run DOS programs, it would be necessary for that user to resolve the fdubcd.ISO bug (instead the wrong fdubcd.IMG) before burning. For interested users, the relevant instructions to resolve the bug are also published in the UBCD51a1 announcement topic.